"I am so happy we're having a boy," the 35-year-old said when she found out the child's gender. "It's going to be perfect for our family."

It's an extended family primarily dominated by women, but that's neither here nor there ...

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Kardashian and her longtime beau are already parents to son Mason, 5, and daughter Penelope, 2.

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The petite fashionista let Mason break the news to the rest of the family, including Kim Kardashian and momager Kris Jenner, while Kim captured the whole exchange on video.

The little guy ran in the room carrying a blue star on a stick, indicating that he's having a little brother.

"Mason ran in here with the blue stick. There was a red star or a blue star," Kourtney said of the reveal.

The expectant mother, who is reportedly due next month, took a cue from younger sister Kim and posed nude for DuJour magazine's latest issue.

"To me, nudity is not something to be ashamed of. I'm not embarrassed of my body. I'm at my best when I'm pregnant," she told the magazine. "It's such an amazing feeling, the transformation that your body goes through. There's something about that that's so empowering and beautiful and I just really embrace it."